2001 GMC C1500 No headlights

2001 GMC C1500
165,000 MILES • V8 • 4WD • AUTOMATIC
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BRIAN2112
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security light remains on in dash, right side door lock .works, left side will lock but not release .

Headlights out, interior lights out.

brake lights ok, running lights ok

Pickup runs normal.

This vehicle sit for long periods at a time.
Dec 28, 2009 at 4:01 PM
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JDL
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Welcome to the forum, as far as the headlights, check for voltage and ground at the headlamps. The orange wire is voltage, goes hot when you turn on the headlamp switch. The ground circuit, yellow wire is ground for low beams. puple wire is ground for high beams. I'd check for voltage first. There is a headlamp relay in the underhood junction block. Voltage for load side of relay, is hot all the time. the voltage for coil side of relay comes from the headlamp switch. You need to be sure the battery has a full charge and the connections are good.
Dec 28, 2009 at 4:20 PM